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CALGARY - Tyler Seguin had his first four-goal game while Jamie Benn had one goal and a career-high six points Thursday night as the Dallas Stars scored four straight goals in the second period to run away with a 7-3 victory over the Calgary Flames.

Joined on the Stars' top line by rookie Valeri Nichushkin, the formidable Dallas trio was too quick, too skilled and just too elusive for the Flames, who were a step behind all night and could not contain them.

Seguin opened up the second period onslaught at 1:19. Benn got the puck to the front of the net where Flames goaltender Reto Berra stopped Seguin on the first shot, but with the puck lying at his feet for an uncontested second try Seguin easily fired the puck over the prone goaltender.

The same combo struck again at 4:25. TJ Galiardi's no-look backhand pass was intercepted at centre by Alex Goligoski who zipped a pass to Seguin, who in turn neatly set up Benn at the side of the net.

Four minutes later, another dandy passing sequence between the two, finished off by Seguin, made it 4-0 and ended the evening for Berra, who was replaced by Karri Ramo.

That also ended the night, figuratively, for the Flames, who got as close as 6-3 in the third period before Seguin scored his fourth and team-leading 12th goal on the power play at 16:21.

Stephane Robidas and Ryan Garbutt also scored for Dallas (10-7-2). The Stars have won five of their last six and have reeled off five straight road victories. Goligoski had three assists.

Matt Stajan, with a pair, and David Jones replied for Calgary (6-10-3). The slumping Flames are winless in their last five.

When the Flames and Stars met three weeks ago, Dallas was last in the West, four points behind the Flames. Since that night when Dallas won 5-1, Calgary has gone 2-7-1 while the Stars have gone 7-2-2.

Thirty seconds into the third period, Seguin scored his third goal of the night to make it 6-1.

An aggressive forecheck from Benn knocked the puck away from Chris Butler. Nichushkin got the puck and eventually wheeled out of the corner and sent a shot on goal that Ramo stopped but the rebound deflected right to Seguin who buried his team-leading 11th goal.

Calgary got a power-play goal from Jones and a short-handed goal from Stajan later in the third but the game had well been decided by that point.

With 13 saves on 17 shots, Berra took the loss to fall to 1-3-1. Ramo had 12 stops on 15 shots.

Lehtonen, starting his 11th game in a row and on consecutive nights after shutting out the Edmonton Oilers 3-0, made 25 saves in improving to 9-3-2.

The game began as many have for the Flames, who gave up the first goal.

At 6:27, Dennis Wideman gave the puck away and then ended up screening Berra as Robidas scored on a slapshot from the blue-line.

Calgary has given up the first goal in seven of its last eight games and has been outscored 11-1 in the first period.

Notes: Nichushkin, Trevor Daley and Goligoski led the Stars at plus-4 ... Wideman played in his 600th NHL game while RW Tim Jackman appeared in his 400th for the Flames ... Scratched for the Flames was D Derek Smith ... Dallas iced the identical lineup to what they deployed against the Oilers on Wednesday ... Mike Cammalleri's three-game goal-scoring streak came to an end for Calgary ... Flames are 3-1-1 when they do score first.